#include <signal.h>
#include <string.h>
#include "locale_impl.h"

#if (SIGHUP == 1) && (SIGINT == 2) && (SIGQUIT == 3) && (SIGILL == 4) \
 && (SIGTRAP == 5) && (SIGABRT == 6) && (SIGBUS == 7) && (SIGFPE == 8) \
 && (SIGKILL == 9) && (SIGUSR1 == 10) && (SIGSEGV == 11) && (SIGUSR2 == 12) \
 && (SIGPIPE == 13) && (SIGALRM == 14) && (SIGTERM == 15) && (SIGSTKFLT == 16) \
 && (SIGCHLD == 17) && (SIGCONT == 18) && (SIGSTOP == 19) && (SIGTSTP == 20) \
 && (SIGTTIN == 21) && (SIGTTOU == 22) && (SIGURG == 23) && (SIGXCPU == 24) \
 && (SIGXFSZ == 25) && (SIGVTALRM == 26) && (SIGPROF == 27) && (SIGWINCH == 28) \
 && (SIGPOLL == 29) && (SIGPWR == 30) && (SIGSYS == 31)

#define sigmap(x) x

#else

static const char map[] = {
    [SIGHUP]    = 1,
    [SIGINT]    = 2,
    [SIGQUIT]   = 3,
    [SIGILL]    = 4,
    [SIGTRAP]   = 5,
    [SIGABRT]   = 6,
    [SIGBUS]    = 7,
    [SIGFPE]    = 8,
    [SIGKILL]   = 9,
    [SIGUSR1]   = 10,
    [SIGSEGV]   = 11,
    [SIGUSR2]   = 12,
    [SIGPIPE]   = 13,
    [SIGALRM]   = 14,
    [SIGTERM]   = 15,
#if defined(SIGSTKFLT)
    [SIGSTKFLT] = 16,
#elif defined(SIGEMT)
    [SIGEMT]    = 16,
#endif
    [SIGCHLD]   = 17,
    [SIGCONT]   = 18,
    [SIGSTOP]   = 19,
    [SIGTSTP]   = 20,
    [SIGTTIN]   = 21,
    [SIGTTOU]   = 22,
    [SIGURG]    = 23,
    [SIGXCPU]   = 24,
    [SIGXFSZ]   = 25,
    [SIGVTALRM] = 26,
    [SIGPROF]   = 27,
    [SIGWINCH]  = 28,
    [SIGPOLL]   = 29,
    [SIGPWR]    = 30,
    [SIGSYS]    = 31
};

#define sigmap(x) ((x) >= sizeof map ? (x) : map[(x)])

#endif

static const char strings[] =
    "Unknown signal\0"
    "Hangup\0"
    "Interrupt\0"
    "Quit\0"
    "Illegal instruction\0"
    "Trace/breakpoint trap\0"
    "Aborted\0"
    "Bus error\0"
    "Arithmetic exception\0"
    "Killed\0"
    "User defined signal 1\0"
    "Segmentation fault\0"
    "User defined signal 2\0"
    "Broken pipe\0"
    "Alarm clock\0"
    "Terminated\0"
#if defined(SIGSTKFLT)
    "Stack fault\0"
#elif defined(SIGEMT)
    "Emulator trap\0"
#else
    "Unknown signal\0"
#endif
    "Child process status\0"
    "Continued\0"
    "Stopped (signal)\0"
    "Stopped\0"
    "Stopped (tty input)\0"
    "Stopped (tty output)\0"
    "Urgent I/O condition\0"
    "CPU time limit exceeded\0"
    "File size limit exceeded\0"
    "Virtual timer expired\0"
    "Profiling timer expired\0"
    "Window changed\0"
    "I/O possible\0"
    "Power failure\0"
    "Bad system call\0"
    "RT32"
    "\0RT33\0RT34\0RT35\0RT36\0RT37\0RT38\0RT39\0RT40"
    "\0RT41\0RT42\0RT43\0RT44\0RT45\0RT46\0RT47\0RT48"
    "\0RT49\0RT50\0RT51\0RT52\0RT53\0RT54\0RT55\0RT56"
    "\0RT57\0RT58\0RT59\0RT60\0RT61\0RT62\0RT63\0RT64"
#if _NSIG > 65
    "\0RT65\0RT66\0RT67\0RT68\0RT69\0RT70\0RT71\0RT72"
    "\0RT73\0RT74\0RT75\0RT76\0RT77\0RT78\0RT79\0RT80"
    "\0RT81\0RT82\0RT83\0RT84\0RT85\0RT86\0RT87\0RT88"
    "\0RT89\0RT90\0RT91\0RT92\0RT93\0RT94\0RT95\0RT96"
    "\0RT97\0RT98\0RT99\0RT100\0RT101\0RT102\0RT103\0RT104"
    "\0RT105\0RT106\0RT107\0RT108\0RT109\0RT110\0RT111\0RT112"
    "\0RT113\0RT114\0RT115\0RT116\0RT117\0RT118\0RT119\0RT120"
    "\0RT121\0RT122\0RT123\0RT124\0RT125\0RT126\0RT127\0RT128"
#endif
    "";

char *strsignal(int signum)
{
    const char *s = strings;

    signum = sigmap(signum);
    if (signum - 1U >= _NSIG-1) signum = 0;

    for (; signum--; s++) for (; *s; s++);

    return (char *)LCTRANS_CUR(s);
}
